In the last video, you might have heard the term of digital signatures and certificates.
This video we are going to learn about digital signatures and where are they used and what is the importance
also?
We will have a long discussion on the digital signature process so that you can understand the concept
clearly.
Let's start digital signatures like electronic fingerprints in the form of a coded message, the digital
signature securely as a sign of the document in a recorded transaction.
Digital signatures use a standard accepted format called public infrastructure, which we have already
seen in the last video, B.K. is used to provide the highest levels of security and universal acceptance.
They are a specific signature technology and implementation of electronic signatures that is e-signature.
So in technical terms, a digital signature is a mathematical scheme for verifying the authenticity
of a digital message.
They are symmetric cryptography to simulate the security properties of a signature in the detail rather
than in return for.
Now, you have already heard of the term electronic signatures, so what is the difference between a
digital signature and an electronic signature?
The broad category of electronic signatures encompasses many types of electronic signatures.
The category includes digital signatures, which are a specific technology implementation of electronic
signatures.
Both digital signatures and other signature solutions allow you to sign documents and authenticate the
sign.
However, there are differences in purpose, technical implementation, geographical use and legal and
cultural acceptance of these signatures.
In particular, the use of a digital signature technology for signatures varies significantly between
countries that follow up on technology like the United States, United Kingdom, Canada and Australia.
In the European Union, Southern America and Asia, these techniques are also.
In addition, some industries also support specific standards that are based on digital signatures.
Now, what is the use of a digital signature?
Why can't you just go and sign the document?
Well, if Bob or your friend is in the United States and you are in India, it would cost around one
and a half left to go there and just sign the document.
So digital signatures are used to send and receive encrypted emails that are digitally signed and secure,
they carry out online secure transactions and they can identify participants online transaction.
Digital signatures makes use of one of the most important elements of information security, of non
repudiation.
If you have digitally signed a document, you later cannot deny that you haven't signed the document.
So digital signatures are used to sign and validate what documents excel in PDF format and everything.
Digital signatures are a convenient way to authenticate an identity.
It also provides high level of security for online transactions.
Digital signatures are used to verify the identity of the sender of the message.
Like I said, one cannot deny having digitally signed a document.
These are signatures to an important role for designing and signing contracts of big Elution's.
Digital signatures remain unchanged throughout the communication or documentation, and they're easily
transportable and cannot be imitated by anyone else.
Now, the most important thing is you have learned the theory part of digital signatures, so to get
authority and get.
It's time to actually see the process of digital signature.
Well, how do digital signatures work, as you can see on your screen?
This is a long process.
Let's start exploring it by one.
By one.
Digital signatures, like handwritten signatures are unique to each sign digital signature solution
providers such as DocuSign, for example, follow a specific protocol Patika that is public, the infrastructure.
Bikaner requires the provider to use a mathematical algorithm to generate too long no call, Keith.
We have seen keys in the cryptography introduction videos.
One is the public key and another is a private.
So when a sign electronically signs a document, the signature is created using the sign of priority,
which is always securely kept by the sign.
So suppose you are signing a document that which means that you are creating a document using your own
private key.
The mathematical algorithm acts like a cipher, creating data matching the signed document called Hash,
and then it encrypts the results.
Encrypted data is called as the digital signature.
Signature is also marked with the time that the document was signed, so the document changes after
signing the digital signature is Invalides.
So let's take an example.
Jeanne signed an agreement to set time-Share using her private.
The buyer receives the document, the buyer who receives the document also receives a copy of Jean's
public.
Now, you may ask, these should be private.
Well, well, well, public keys are of public knowledge and private key is only restricted to you.
If the public can't decree the signature means that the signature is in jeans or has been changed since
it was signed.
So to me, in simple terms, Jean signs a certificate or a document with her private key, and if you
are not able to decrypt it with hers publicly, then there's a problem.
So to protect the integrity of the signature public infrastructure requires that the keys that are created
and conducted should be saved and transported properly.
In Reliable Men, digital signature providers like DocuSign or any other vendors you can take, meet
the public key infrastructure requirements for digital sign.
So as you can see on the screen, let's consider.
There's a data that data goes to the harshing algorithm.
Now, the output of the hash is encrypted, the sign ups priority and that entire thing is known as
digitally signed document that is digital signature, not that digital sign document is sent over the
Internet to the vendor to verify, verify, get the digital design document verifiable, applies the
description of the key and gets the hash hidden.
Applies hash algorithm, which is equal and therefore signature is validated when hash values are equal.
Now, which Heschel used to compute in the upper figure, you can see this, a private key encryption,
that hash value must be equal to the hash value that is obtained after decrypting.
So this was a long lecture in the next lecture.
We'll see what a transport layer security.